21152930 has 16 divisors (see below), whose sum is σ = 40315320. Its totient is φ = 7963392.

The previous prime is 21152921. The next prime is 21152951. The reversal of 21152930 is 3925112.

It can be written as a sum of positive squares in 4 ways, for example, as 13965169 + 7187761 = 3737^2 + 2681^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21152896 and 21152905.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62045 + ... + 62384.

Almost surely, 2^21152930 is an apocalyptic number.

21152930 is a deficient number, since it is larger than the sum of its proper divisors (19162390).

21152930 is a wasteful number, since it uses less digits than its factorization.

21152930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124453.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 21152930 is about 4599.2314575372. The cubic root of 21152930 is about 276.5605163657.

The spelling of 21152930 in words is "twenty-one million, one hundred fifty-two thousand, nine hundred thirty".